Not at all off topic, Blacksheep, because one view is that the size of the wattle is (in homers, anyway) a guide to age, whilst others may not think it relevant.
Another strange thing is, looking at our rescue birds, coloration on red bars. I've noticed that with our male red bars, as they age so they develop black 'flecks' in their feathering. It's just a few at first, but one who is now over 10 years old has dozens of them. Doesn't seem to happen with our hens. Still doesn't tell us just how old they actually are, but it's an indication (or coincidence?).